Robert P. J. Day wrote:
Add the inline function "is_power_of_2()" to log2.h, where the value
zero is *not* considered to be a power of two.
Signed-off-by: Robert P. J. Day <[email protected]>
/*
+ * Determine whether some value is a power of two, where zero is
+ * *not* considered a power of two.
+ */
Why the qualifier? Zero *is* not a power of 2, is it?
+
+static inline __attribute__((const))
+bool is_power_of_2(unsigned long n)
+{
+ return (n != 0 && ((n & (n - 1)) == 0));
+}
+
+/*
* round up to nearest power of two
*/
static inline __attribute__((const))
--
SUSE Labs, Novell Inc.
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